A bipolar host based high triplet energy electroplex for an over 10 000 h lifetime in pure blue phosphorescent organic light-emitting diodes
- Authors
- Jung, Mina; Lee, Kyung Hyung; Lee, Jun Yeob; Kim, Taekyung
- Issue Date
- 1-Feb-2020
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- MATERIALS HORIZONS, v.7, no.2, pp.559 - 565
- Journal Title
- MATERIALS HORIZONS
- Volume
- 7
- Number
- 2
- Start Page
- 559
- End Page
- 565
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/587
- DOI
- 10.1039/c9mh01268k
- ISSN
- 2051-6347
- Abstract
- Ultimate device performances of blue phosphorescent organic light-emitting diodes, an external quantum efficiency of 27.6%, a device lifetime over 10 000 h at 100 cd m(-2), and pure blue color coordinates of (0.12, 0.13), were simultaneously achieved using a device architecture employing an electroplex host. A high triplet energy electron transport type host derived from a triazine core, a carbazole substituent, and a triphenylsilyl blocking unit was newly synthesized for the purpose of developing the high emission energy electroplex host. The electroplex host functioned as a carrier balancing host for high external quantum efficiency and a lifetime extending host of pure blue phosphorescent organic light-emitting diodes. This work demonstrates ultimate device performances, high external quantum efficiency and long lifetime, in pure blue phosphorescent organic light-emitting diodes. In particular, the lifetime limit of pure blue phosphorescent organic light-emitting diodes was overcome by demonstrating an over 10 000 h lifetime.
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